Grounding; Momentary Power Drop; Safety - Panasonic FP-M Hardware Manual

Operating voltage range
Item
Controller's power supply
I/O power supply

3) Grounding

• The FP-M has sufficient noise resistance under low noise level conditions. However, ground the FP-M for safety.
• When grounding, an earth-ground resistance of 100 Ω or less is recommended to limit the effect of noise due to
electromagnetic interference.
• Ground each board by grounding the mounting plate or spacers.
• Do not use a grounding wire with 2 mm

4) Momentary power drop

• The FP-M is not influenced by momentary power drops (less than 10 ms).

5) Safety

• In certain applications, malfunction may occur for the following reasons.
An operation time lag when a momentary power drop occurs.
Abnormality in the FP-M, power supply circuit, or other devices.
• In order to prevent malfunction from resulting in system shutdown, the following special attention is required.
Start up sequence:
The FP-M should be operated after all of the outside devices are energized. To keep this sequence, the following
measures are recommended.
Set the mode selector from PROG. to RUN after power is supplied to all of the outside devices.
Program the FP-M so that it disregards the inputs and outputs until the outside devices are energized.
Emergency stop circuit:
Add an emergency stop circuit to controlled devices in order to prevent a system shutdown or an irreparable
accident when malfunction occurs.
Interlock circuit:
When two motions that are opposed to each other are controlled, add an interlock circuit between the
programmable controller's outputs and the control device.
e.g.:
When a motor clockwise/counter-clockwise operation is controlled, provide an interlock circuit that prevents
clockwise and counter-clockwise signals from inputting into the motor at the same time.
Operating voltage range
21.6 to 26.4 V DC (all control boards)
20.4 to 26.4 V DC (C20T, C20TC, C32T and C32TC)
22.8 to 26.4 V DC (C20R and C20RC)
2 or larger conducts, that is shared with other devices.
Other
FP-M
device
Correct
Other
FP-M
device
Incorrect
4-3. Wiring
47